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We image local structural rearrangements in soft colloidal glasses undersmall periodic perturbations induced by thermal cycling. Local structuralentropy $S_{2}$ positively correlates with observed rearrangements in colloidalglasses. The high $S_{2}$ values of the rearranging clusters in glassesindicate that fragile regions in glasses are structurally less correlated,similar to structural defects in crystalline solids. Slow-evolving high $S_{2}$spots are capable of predicting local rearrangements long before therelaxations occur, while fluctuation-created high $S_{2}$ spots best correlatewith local deformations right before the rearrangement events. Local freevolumes are also found to correlate with particle rearrangements at extremevalues, although the ability to identify relaxation sites is substantiallylower than $S_{2}$. Our experiments provide an efficient structural identifierfor the fragile regions in glasses, and highlight the important role ofstructural correlations in the physics of glasses.

Structures of local rearrangements in soft colloidal glasses